Lamp-supporting device.



R. B. BENJAMIN LAMP SUPPORTING DEVICE. APPLICATION FILED APR.7, 1911.

1,088,866, Patented Mar. 3, 1914.

3 SHEETS-SHEET l.

If r I R. B. BENJAMIN.

LAMP SUPPORTING DEVICE.

APPLICATION FILED APR 7, 1911.

1,088,866. Patented M21123, 1914.

3 SHEETS-SHEET 2.

. B. BENJAMIN.

SUPPORTING DEVICE. TIOH FILED AP 7 AP 1. 1,088,866, Patented Mar. 3, 1914.

3 SHEETS-SHEET 3.

[ UNITED STATES PATENT OFFICE.

REUBEN B. :BENJAnIN, or C-HICAGO," znnmorsnssrenon, Y MESNE AS'SIGNMENTS, TO GENERAL nnncrnrc 'COMI-ANY, or SCHI-NECTADY, NEW YORK, A CORPORATION Lornnw YORK.

T0 all whom it may concern:

Be it known that I, REUBEN B. BENJAMIN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have inventednew and useful Improvements in Lamp-Supporting Devices, of which thefollowing is afull, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this specification. Y

My invention pertains to electric lamp supporting devices; and especially relates to lamp sockets of a character adapted for series connection in high tension circuits.

' It is theprincipal object of my invention to improve upon lamp supporting devices for series use in high tension circuits,-by'

rendering. them simpler and more durable in construction, safer and more convenient in use, and more economical to manufacture andmaintain.

A high tension series socket, constructed in accordance with my invention, is described in the following specification and shown: in the accompanying drawings. I have chosen the socket shown in the drawings as a goodexample of an embodiment of my invention, since it has been constructed and found entirely satisfactory; but it is to be understood thatthe invention, as defined inthe appended claims, may be embodied in other'cons'tructions.

In the drawi'ngs-:'Figure 1 is an inverted plan of the/body of 'the socket. with the separable lamp freceiver remov'ed; Fig. 2 is a verti'c'alsectioxr'throughj'the lamp socket, the

section be'ingtakenonthe line 2-2 of Fig. 1; Figs. 3' andt are; fragmentary sectional views taken through the body of the socket and theseparab'le lamp receiver, the sections beingtakenon' lihes and 4 4:, respect iyely ofFig. lamfp'freceiver, Fig. "6 is a side elevation of the lamp; receiver'l'ooking inf tlf 'ifrectio'n oppositetofthe' arrow (Fig. 7 is a side elevation-of the lamp receiver" showing theside thereof opposite to tlr'atseeii' in F ig. 6; Fig; 8 is' a horizontal sectionion' the line 88 of FigfQ looking in the direction'iof the 9 is an :mmrreapmn of arrows," and? Fig. the shadew The socket shown'in the drawings is made in two {separable portions, one of {which (herein-termed the body )"is adapted to be attached to a. suitable supporting device,

I LAMP-SUPPORTING Dnvrcn.

Specification of Letters ihtentf Applicationflle(1 April7,1911. Serial No. 619,546.

to lead them to the binding terminals.

1 is a plan of the Patented Mar. 3, 1914.

such as a conduit or the like. The body 'c'arries the binding terminals and the center lamp'engaging contact. The other portion (herein called the lamp receiver) carries the threaded lamp receiving shell, which, when the portions are connected together, is brought into electrical connection with one of the binding terminals. One of these portions carries a pair of contacts which, when connected, short-circuit the lamp engaging contacts, and between which may be placed a film of mica, or other insulating material, ofsuch thickness that it can be broken down by the currentwhen the latter can find no shunt path through J the lamp.- By this means the socket is short-circuited in case of the destruction of the lamp carried thereby and the extinguishing of the other lamps connected in the circuit is avoided. Referring now to the drawings by reference characters, the body consists ofa base 11 having two lateral knobs or extensions 12 formed integral therewith, around which knobs the conductors may be passed in order Secured to the base 11 by means of screws 13 is a supporting member 14, the upper end of WlllCl'l'lS threaded to receive a bushing 15 which is internally screw threaded to receive a conduit or other support 16. Surrounding the'supporting member 14, and secured in place, through the agency ofwashers l7 and 18, by the bushing 15, is an insulating hood 19, the lower edge of which closely approaches the top surface of the base 11. The'hood 19- is of-larger diameter than the base 1l,so that it will shed o-tl rain water" and aid in preventing the lamp" carrying tertight connection is formed.

The basell? is hollowed.- out at its lower side to form a chamber21 in which the various conducting parts of the socket are mounted; In a recess in the bottom of this chamber is secured, by means of a screw 22, a strip 23 which carries atone end a binding terminal 24, thestrip being so arranged that the binding terminal 24 is located adjacent one end of a groove 25 formed in the lower face of the base directl beneath oneof the knobs 12. As the kno s are formed integrally with the body, this arrangement in- .sures that the line conductor shall not lie against any metallic member; and the insulation of the device is thereby increased. This groove provides a passage way for the lead conductor which isto be connected to the binding terminal 24. Clamped beneath the plate 23 is an arched resilient member which forms the center contact 26 ofthe socket. The contact 26 extends beneath a yoke-shaped lug 27 carried by a plate 28, and makes contact therewith, except when forced backv by the end of a lamp. The plate 28 is clamped beneath a conducting strip 29, which is secured'in place by means ofscrews 30. The strip 29 is provided with a binding terminal 31 disposed opposite to the binding terminal 24 and ad acent the end of a groove 32 similar to the groove 25. As has been stated, the resilient contact 26 is so arranged that,when a lamp is not in position in the socket, it will make connection with the lower side of the lug 27, elec-r' trical connection thereby being established between the binding terminals 24 and E31.

lamp receiving .shell and The result is that the socket is short-circuited'when a lamp is not imposition in the socket, or when alamp becomes so loose in the socket that it ceases to make contact with a 'the center contact 26. The socket is intended to be connected in series with other sockets and, were this provision not made, the removal of-one lamp would, in theab-; sence of other safety devices, extinguish-all the other lamps in the circuit," I j Extending across the bottom of theJchaInber 21 and connected at'its center to-the, end of the plate 28 is a contact piece 33 the ends of which are bent up and over'to formv cars 34 and 35 by means of which the lam' receiver is secured to the base 11 and which serve to establish connection between the the binding;terminal 31 througlr the intermediary of plate 28 and strip 29. A resilient tongue- 36 is clamped between the strip 23 and the resilient contact 26, and is arranged to make connection with a corresponding contact on' the lamp receiver'for a purpose which will behereinafter set forth. A leaf spring 37 is clamped between the plate 28 and the base and extends outward beside the yoke-shaped lug 27 and beyond the'same. The spring 37g serves to lock the lamp receiver in co'nnec tion with the body,a-s will hereinafter be! described. I The lamp receiver comprises an-insulati-ng bushing 38 of such a size as to readily enter the chamber 21 of the body, and a thread (1, lamp-receiving contact 39 mounted in t e bushing 38tso as to be capable oflongitudibro the between the threaded contact 39 and the v bushing 38 being prevented by a downwardly turned lug 44 (Figs. 5 and. 6), stamped out of the flange 43, which engages in a suitable recess in the bushing 38. It

will be seen that this manner of connecting the threaded c0nta'ct39 with the bushing 38 permits the bushing to be moved longitudinallyrwith 'relation to the threaded. con tact, against the action of the spring 41;

however, the spring normally maintainsthe bushing in the position in which the flange- 43 engages against the top surface of the bushing. In connecting the lamp receiver to the body, the ears 34 and 35 of the contact piece '33 of the latter enter beneath, and are maintained in position beneath. the flange 43 of the former, abayonet connection between these parts beingthu's effected; and in order to obtain this result, the flange 43 of the, lamp receiver is cut away -at'45 and 46 to forin notche through which may be passed the'ears'34 and 35,'respectively, of the contactlpiece 33.- The to surface of the bushin'g-38 is cut away, a jacent the notches 45 v and 46,130 47 and 48, into which the "ears :and 35 enter when; they are passed through the notches 45and 46; so

t hat, by efie'ctmg a turning movementof the 'l'amp receiver atively to the body, the ears 34 and- 35 may-be made-ito engacgf beneath the flange 43),;Just beyond thelliot es.;45 and 46; by efiectmga turning movement ofithe lamp receiver relatively to the-body in an opposite-direction the ear-s34 andx35 "are ht opposite the: riotches45 and 46 of ange 43, whereupon the lamp receiver may be. withdrawn from"the body. When the-lamp receiver i connected to the body,

" as described above, current flows from the line to the-binding terminal 24, and thence,

Via-thecenterLcQntact 26, to'the center contact of'the lamp (provided that a lamp is present in the'socket), through the lamp to will spring outward into connection with the 1 lug 27 andlthe socket will thereby be short the threaded contact 39 and flange 43, and thence,

circuited, the current "flowing from the hinding'terminal 24, through the plate 23 .to the center contact 26,,and thence, through the lug 27- and plate 29, to the other'j b'inding terminal 31.

. Lamp sockets ofthecharacter herein described are frequently' 'used in situations Where, they are subject, tdconsiderable vition; and it is-desirab'le, therefore, to

p'rpvide mantra locking the lamp receiver 'in'fcennection with the body, so that it cannot beecciaeatany separated therefrom, but

may be 'ren'ioved by an" attendant when it is desired to replacethe"dielectric. or the like.

To this end, [provideithe insulating bushing" 38 with a bevel'ed'si'irface 49' extending down one side thereof, and solocated that it willjbe directly opposite to the leaf spring 37, referred to above, when the notches 45 --are 'brought* opposite to the ears 34 and 35 and 46 ofthe flange 43 ofthe lamp receiver of the contact piece 33,-preparatory to connecting the lamp receiver to v the body. When, therefore, the lamp receiver is pushed inward relatively to the body, the leaf spring 37, of'the body, engages the beveled surface 49; .and is thereby sprung' outward from its normal position. The bushing 38 is .providedfwith a recess which is '30 catedj ust beyond the bevele'd surface 49; so that a shoulder 51 is created between the re- -cess 5dand the beveled' 'sui'face 49. -When the lamp receiver is turned, after being pushed forward to cause the ears 34 and to enter the notches 45 and 46, to effect the bayonet connection of the lamp receiver with connection ofthe parts this is owing to the engagement of the leaf 's'priiig 37 "against the shoulder 51 (Fig? 8). Accidental separation of the lamp receiver from the body is thus prevented; but, when it is desired to disconnect the parts for some reason, this may be done by'pulling upon the bushing 38, whereupon the latter moves outward relatively to the threaded lamp contact 39 and its flange 43, 'the latter parts remaining stationary relatively to' t-he'b'odyfi 'Th'isoutward' move ment of the bushing38 hasthe effect of free ing theleaf' spring 37 from the recess 50,-

that is, moving the sl1'oulder"51' out of the way of the leaf spring 37; and the b'usl "n 38, carryingwvith it the lamp receiving con tact 39, may-then turned until-theif nfotcliels 45 and 46 of the flange 43 come opposite'the ears134 and"'"35,fthe partsbeing thus disco n;

mected- This; disconnection ofthe parts occ-urs with a *snap;-owing to the tendency ois-t. l1e{spring -41- (which is under tensionft'o return the threaded sleeve'39 to its' normal position relatively to This sna-paction is very desirable inthat it precludes any chance of sparking between the current carrying contacts.

A contact strip'52 is secured, at-oneend, to the flange 43 of the threaded lamp contact, the-securing being eflected by clamping the end of the strip beneath a pair of .overturned lugs 53 formed upon the flange43 .(Figs. 5, 6 and 7), a suitable insulating filling being inserted between the strip 52. and the flange 43 and lugs 53,whereby the contact. strip is insulated from the flangee43. 'The contact strip.52 is-adapted :to make path, broken only by the dielectric, is pro-- vided across the lamp terminals- When a lamp, in proper condition, is present in the socket, there is not enough difle-rence of potential between the contact strip .52 and the table 54, to efi'ect .the breaking down of Jthedielectric: when, however, the lamp fila ment becomes burned out, or invcase the lamp itself should be broken, thetotalyoltage of the circuit occurs between the contact strip 52 and the table 54,the resultcbeing thatthedielectric isbroken down, and current passes from the contact strip- 52 to the table 54, the socket being thus short circuited. By this means, the extinguishing of the other lamps in the line is prevented. The

defect may be. remedied by removing the lamp receiver, inserting a fresh dielectric, and replacing the spoiled lamp by a new one.

i The body is formed, at its ,lower face, with e a circular channel 56, (LF igs. land 2) of such proportions to conveniently receive theupper end of a shade57, t-he shade being secured in position by means of screws passing through an inwardly extending flange 58, with which the shade is pro ided, and entering suitable screw holes 59 in the body. A' washer 60 is placed between the flange 58 and the body. In order that the lamp receiver. may1he connected withthe body, it is necessar .th at f th e slots 45.;and- 46 be brought exactly opposite-to the lugs. 34 and 35, respectively; and, .in order;.-to, facilitate this,-,the ,shade isprovided; with a small notch 61 which forms-a guidegfor,

aboss 62 which-extends"laterally from the it insulating bushing .38fof the lamp receiver,- the notch Gland the boss.62 being so arranged that theslots 45 and 46 will be precisely opposite to the lugs 34 and 35 when the boss 62 is placed opposite to the notch 61. As the lamp receiver cannot be connect: ed with the body without first passingthe boss 62 through the notch 61 of the shade, it will be seen that the correct relative positions of the lamp receiver and the body, prior to the connecting .iovement, is thus insured In order to provide room for the boss 62, when the latter is passed through the notch in the shade, and when it is turned when the bayonet ,ponnection is made, the body is formed with an elongated slot 63, located just behind the notch 61 of the shade and extending beyond such notch in the direction in which the lamp receiver is r0- tated to eifect the bayonet connection.

The lamp socket described above has several marked advantages over devices of a similar character in the form in which it has hitherto been proposed to manufacture them. In the first place, there is very little danger of the dielectric becoming broken down, except in the case of the lamp filament burning out or becoming broken; for instance, in case the lamp should jolt loose in the lamp receiver, or in case, for some reason, it should be-desirable to remove the lamp without disconnecting the lamp .receiver, the dielectric would not be broken down,owing to the fact that a shunt path would be created across the center socket contact 26 and the lug 27 as soon as the lamp became sufiiciently loose in the socket for current to stop passing therethrough. In the second place, the separable parts of the socket are constructed so that they may be connected together with facility, and, when connected together, are locked so that they cannot be separated except by a movement of a peculiar charactera movement which requires a conscious intention to efiect it-being imparted to the lamp receiver; with the result that accidental separation of the parts is practically impossible, while the parts may be separated, when desired, with the greatest case. In the third'pla'ce, the lamp receiver, when there is no lamp therein, may be removed from the body without in any way affecting the electrical connections: this is an important advanta e since it prevents sparking, which won (1 otherwise be very liable to occur, owing to the high voltage of the line. Again, the socket is of a simple construction, and there are no parts which are at all liable to get out of order in the course of the use of the device.

What I claim as'new and desire to'secure' by Letters Patent, is:

1. A separable'lamp socket comprising a body, a center lamp-terminal-engaging contact carried thereby, a second contact carried by said body, a lamp receiver detachably connected with said body and including an outer-lamp-terminal-engaging contact having aportion making engaging connection with said second-named contact when the lamp receiver is connected with the bo'd and manually releasable means, actuatabi e from the outside of said lamp receiver, for connecting said lamp receiver with said body,

2. A separable lamp socket comprising a body; a center-lamp-terminal-engaging contact carried thereby; a second contact carried by said body, a lamp. receiver adapted to be detacha-bly connected with said body and including an outer-lamp-terminal-em gaging contact adapted to make connection with said second-named contact when the lamp receiver is connected with the body; and means for connecting the lamp receiver with the body, said connecting means being detachable without removing the lamp from said receiver.

3. A separable high-tension series socket" comprising av body, including a support, a center-lamp-terminal-engaging contact car ried by said support, and a second contact carried by said support; a lamp receiver including an outer lam terminal engaging contact adapted to ma e connection with the second-named contact of said body when the lamp receiver is connected to the body, and dielectric receiving contacts insulated from each other and adapted to make connection, one with said center-lamp-terminal-engaging contact, and the other with said outerlamp-terminal-engaging contact, when said body and said lamp receiver are connected together.

4. A separable high-tension series socket comprising a body, including a support, a center-lamp-terminal-engaging contact carried by said support, a second contact carried by said support, and means for causing said center-lamp-terminal-engaging contact to make connection with said second-named contact when the lamp receiver is disconnected from said body; a. lamp receiver including an outer-lamp-terminal-engaging contact adapted to make connection with the second-named contact of said body when the lamp receiver is connected to the bod and dielectric receiving contacts insulate from each other and adapted to make connection, one with said center-lamp-terminal-engaging contact, and the other with said outer lamp-terminal-engaging contact, when said body and said lamp receiver are connected together. I

5. A separable high-tension series socket comprising a body, including a support, a center-lamp-terminal-engaging contactcar ried by said support, a second contact carried by said support, and means'for causing said centerdamp-terminalengaging contact to make connection with said second-nan1ed contact when a lamp is not present in the lamp receiver alamp receiver including an outer, lamp: terminal-engaging contact adapted to make;connection with the secondnamed contact: ofsaid body. when the lamp one with said" center-lanip-terminal engag ing contact, and'the other with said-outerlamp-terminal-engaging contact, when said body and (Said; lamp receiver are connected together.

G. A separable high-tension series socket,

comprising a body, including a support, a contact carried by said support; a springcenter-lamp-terminal-engaging contact carried by said support, and adapted to make connection with" said first-named "contact wvhen not-engaged by the center terminal 01? a lamp; a lamp receiver including an outerlamp-terminal engaging contact adapted to make connection w-ith the first-named contact of said bodywhen the lamp receiver'is adapted to make connection,- center-lamp-terminal-engag1ng-contact, and

connected to the body, and dielectric receiving contacts insulated from each other and one-with said thelot-herwith said outer-lam -terminalengaging contact,-when said 'bo y and said lamp receiver are connected together 7. A separable lamp socket comprising a gbody; a center-lamp-terminal-engaging conconductor and- 'y siidiibedr a adapted to e connected to a lead conductor 5;, a metallicbayonetprojectioncarried by said body an d. I adapted Ito' be connected with the other lead a lamp receiver adapted to bedetachabliy connected with said'body, and

- having a bayonet slot for receiving said bayonet projection, saidylamp receiver i neluding an outer-lamp-terminal-engaging j contact, and] means" for; 'makmg connection between said outer-lamp-termlnal-engaging bayonet projection carried b contactand said bayonetprojection when the lamp receiver is connectedg vith said body. l

8. A separable lamp socket comprising a a center-lamp-terminal engaging conconnected-to .a lead conductor; a metallic said body and "iadapted-to be connected'wit the other lead ,conductor; a lamp receiver adapted to be eluding I iiter-lamp-terminal g ging contact, cans forma'king connection between T iiterdamp-terminalgenga "ng contacta djsaiid'bayonet projec detachably connected with said body, and v having a bayonet slotfor' receiying bayonet pro e 1nction, said lamp rec'e the lamp iece erislc'onnectedf body; and (ans fr detachably? ocliing said .hay et prbjectionin the bayo of the lamp received 'f j v w 9; electr'i il de'vice, comprising afbbdy ifslot body; a centerJam -terminaI-enga 'ng conmember, a second member adapted tobedetachably connected to said body member, a' bushing ;movably secured to saidsecondnamed member, one of said members being provided with a bayonet projection and the other member being provided with a slot through which said projection may pass, whereby a bayonet connection --m'ay be es- .t'ablished between the members, and means forf'locking said members in their connected condition, said locking meansbeingreleasable upon said busliing being moved relatively to said second-named member.

10. An electrical device comprising a member having a bayonet projection, a second member consisting of two relatively movable parts having a slot between them adapted to receive said bayonet projection, and means for locking-said projection against Withdrawal from said slot, said locking means'being releasable upon one of said :parts being moved. relatively to the other.

make connection with said second-named contact when the lamp rece ver s connected with the body; said -"bodyand said lamp receiver being provided ivith inter-engaging bayonet projections i and jsl cf tg whereby ,a bayonet connection may be established between them; and means for detachably locking the bayonet projection .in theslots, said locking means being releasablejupon said in- ,sulating member being movedrel'atively to said outer-lamp-terminal engaging contact. 12. A separable lamp socket comprising a o y? a prminal;en inga9 tact"carried-bysaid"b ond 'contact etter-including an insulatin an outerlamp-terminal-engaging con actTconnected to said insulating member so as to bemovable relatively thereto, said outer-lampterminal-engaging contact being adapted to make connection with said second-named contact when the lamp receiver is connected with the body; said body and said lamp re ceiver being proyided with inter-engaging bayonet prof 't'io'nsjiand slo ts,, whereby a bayonet conncti Iiijmay be 'lestablished be-- tween them; 'saidbody .andrsaid lamp receiver --being' ,jormed with a supplemental; projection andfslot, for insuring the correct I positioning gpif theglamp' receiver when connecting it to; the body. 7 I 13. A sepf'rable lamp socket comprising a tact carried by said body; a'secon contact cess when the sulating member of saidlamp carried'by said body; a lamp receiver including an insulating member having.a lateral projection, and an ouber-lamp-term1nalengaglng contact connected to'said insulatlng member so as to be movable relatively thereto, said outer-lamp-terminal-engaging contact being adapted to make connection with said 'second-named contact when the lamp receiver is connected with the body; said body and said lamp receiver being provided with interengaging bayonet projections and slots, whereby a bayonet connection may be established between them; and a shade carried by said body and having a slottherein for guiding the lateral pro ection of said lamp receiver when the parts are connected together.

14. An electrical device comprising a body member, a second member adapted-to be detachably connected to said body member, a bushing secured to said second-named member so as to be longitudinally movable relatively thereto, one of said members being provided with a bayonet projection and the other member bein provided with a slot through which sai projection may pass, whereby a bayonet connection ma be established between the members, said rst-named member andsaid bushing being rovided, one with a recess, and the other wit I a resilient member adapted to spring into said rewhereby said members are locked together,

gether in such manner as to be releasable when said bushing is moved longitudinally relatively to said second-named member.

15. A separable lamp socket comprising abody; a centerlamp terminal engaging contact carried by said tact carried by said body; a lamp receiver including an insulating member, and an outer-lampterminal-engaging. contact connected to said insulating member 'so as to be lon itudinally movable relatively thereto, said. outer-lamp-terminal1engaging contact being adapted to make connectlo'n'with said second-named contact when the lampreceiver is connected with the body; said body and said lamp receiver being provided with inter-engaging bayonet proj ections and slots, whereby a bayonet connection may be established between them; isaidbody and the inreceiver being provided,one with? areces's, and the other with a resilient member adapted to spring into said recesswhen the lamp receiver is connected with thebody, whereby the lamp receiver is locked to the body insnch manner as to be releasable when the insulating member is moved longitudinally relatively :to the outerJamp-terminal-engaging contact.

16.A high tension series socket comprising two separable portions, a center lamp terminal engaging contact carried by one .of

- portions, an outer lamp termir al engagmembers are connected tobody a second eoning contact carried by the other port-ion, and a pair of contacts carried by one of said portions and adapted to receive a film resistance between them.

17. A high tension series socket COIIIPIIS- ing a body, a center lamp terminal engaging contact carried by said body, a lamp receiver separably connected with said body, an outer lamp terminal engagln contact carried by said lamp receiver, an a pair of contacts carried by said lamp receiver, said contacts being adapted to receive a film resistance between them.

18. A high tension series socket comprising a body, binding terminals on said body, a center lamp terminal engaging contact mounted on said body and electrically connected to one of said binding terminals, a connecting member carried by said body and electrically connected with the other binding terminal, and a lamp receiver removably connected to said body, said lamp receiver comprising an insulatmg member, an outer lamp terminal engaging contact carried by said insulating member and adapted to make connection with said connecting member when the lamp receiver is connected to said body, and a pair of contacts adapted toreceive a film resistance between them.

19. A high-tension series socket comprisi a body, binding terminals carried by said body, a spring center contact carriedfby said body and connected with one of said binding terminals, means connected with the other binding terminal and adapted to be engaged by said center contact when a lamp is, not present in the socket, and a lamp receiver separably connected with said body, and comprising an insulating member, an outer lamp terminal ,engaging contact 105 adapted to make connection with the binding terminal other than "that to which. said center lamp contact is connected, and a pair of contacts adapted to receive a resistance film between them.

20. A high tensionseries socket comprising two separable ortions, one of said portions carrying bin ing-terminals and a lamp terminal engaging contact connected with one of said binding terminals, and the other of 115 said portions carrying a second lamp terminal-engaging contact and a resistance film supporting member arranged to cooperate. with said lamp terminal engaging contact when the portions are connected together;

21. A high tension series socket comprising a body having binding terminals, thereon, a center lamp terminal engaging contact mounted on said body and electrically connected with one of sa1d binding terminals, 9. 125 second contact electrically connected with said first-named contact, a connecting member carried by said body and electrically connected to the other binding terminal, and a lamp receiver adapted to'be removably eon- 1N vice electrically. connected with said outer nected to said body, said. lamp receiver comprising an insulating member, an'outer lam terminal engaging contact carried by sai insulating member and adapted to make connection with said connecting member when the lamp receiver is connected to said body,o.and a resistance film'supporting delamp engaging contact adapted to cooperate with said second named contact when the lamp receiver andthe body are connected 22. An electrical device comprising a member having a ba pnet roject1on, a sec-' 0nd member consisting 0 two relatively movable partshaving a slot between them adapted to receive said'bayonet projection,

and means for locking said projection against withdrawal from said slot, said looking means being releasable upon one of said parts being moved relatively to the other.

-In witness-whereof, I have hereunto subscribed my name in the presence of two witcoplonot this pntut'mq'be obtained for he cents each, by addressing the Comminioner of Patents,

M Washington, D. 01" 

